North Korea fired a long-range rocket last month, but the launch was reported in failure.

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A. to end
(答案→)B. to have ended
C. having ended
D. ending
解析：考查固定句型。Be reported to do sth 报道做了某事，如果是强调一个已经完成的事情，使用不定式的完成式。句意：朝鲜上个月发射了一枚火箭，但是本次发射据报道已经失败了。